The STEEL-LOK Quick Release Steel Rings are available for 30mm and 1“ scope diameter in three different heights and fit for Weaver/Picantinny. The strong steel construction and field tested design provides precise fitting and re-fitting. Made from solid steel. Features: Weaver / Picatinny Design Field Tested Design Matte Black Quick Release Machined from Solid Steel Precise and Reliable Strong Steel Construction Fitted with thumb operated quick detachable levers for easy removal and precise re-fitting to original point-of -impact